And frankly, they all join up 'round the back.*

[bending_sickle]

Lately I've been trying to come up with a way to legitimately put as many crossovers into a single story line as possible. Why? It's cracktastic fun, that's why. It's also surprisingly easy, because every fandom has at least one convenient opening. Especially the supernatural ones.

For example, the easiest points in each fandom that can be used to make a crossover include:

Time-and Space Traveling - You can get there from here or now.
Watchmen: Dr Manhattan
Doctor Who: The Tardis
Terminator: The Sarah Connor Chronicles: The transporter
Heroes: Hiro ; Immortality
Supernatural: The Genie
Buffy the Vampire Slayer / Angel: Portals ; Unnamed "Normal Again" Demon ; Immortality
Life on Mars: hand-waving cars and bullets

Medicine - We'll take you there with flashing lights.
House
Grey's Anatomy
ER
Scrubs

Criminal Activity - You have the right to remain silent.
Castle
CSI
Bones
Supernatural - Even if they're fake IDs.
Heroes - The FBI, The Company, Matt Parkman...
Angel - Angel Investigations
Human Target
Batman
La Femme Nikita
Life on Mars / Ashes to Ashes - Character's original timeline also viable.
X Men

Undercover - We're there even if you don't know it.
Human Target
Supernatural
Buffy, the Vampire Slayer
Angel
Heroes
Human Target
La Femme Nikita
Dollhouse - Not only is the house undercover, but the Dolls could be anyone.
Lost - Character backstories
X Men
Harry Potter
Good Omens
Watchmen - Within timeline constraints.
Batman

The Supernatural - We know weird.
Buffy, the Vampire Slayer
Angel
Heroes
X Men
Lost
Doctor Who
Good Omens

Fixed Fandom - You'll have to come to us.
Firefly
Lost
Planet of the Apes
Pitch Black / The Chronicles of Riddick

Example Crossovers
Watchmen and Ashes to Ashes - 1980's, here we come!
Dollhouse and Bones - FBI Agents and murders, oh my!
Human Target and La Femme Nikita - Undercover men and their L33T hackers face-off!
CSI and Terminator: The Sarah Connor Chronicles - Too many dead bodies lying around for this to end well.
Supernatural and ER (or House or even Lost) - We need a doctor, stat!
Angel and Lost - Physicists need love, too. Especially when they've been portal-and-time travelling.

Sample MultiFandom Crossover - 11 Fandoms
A string of unusual murders get Heroes' Matt Parkman involved (although The Company's already keeping tabs). Angel's Angel Investigations is chasing after rumours of disappearances and possession, with help from Buffy, The Vampire Slayer, and bump into Supernatural hunters doing pretty much the same. The multiple-homicide case is taken by Castle's homicide team (with help from the CSI team) until Bones's FBI Agent Booth gets a call from Dollhouse's ex-FBI Ballard over rogue-Doll Alpha suspsicions. Meanwhile Dollhouse's Senator (and Doll) Daniel Perrin requests Human Target assistance, but the anti-terrorist group of La Femme Nikita is also monitoring the situation, resulting in an epic hacker fight between Guerrero and Birkoff, which is spied on by Terminator: The Sarah Connor Chronicles John, keeping tabs on disturbing new technology which could lead to SkyNet.


Links of the Day:

Supernatural:
jessm78's Picspam Puppy!Sam: Sam, Interrupted
blackcat333_99's Meta Sam, Interrupted: Victims of the crazy, meet the other victims of the crazy.
alleysweeper's Meta Sam, Interrupted: Fuck you, John. - "John Winchester is the demon that most needs to be exorcised from their lives." Fascinating comment discussion as well.
light_ofmy_life's Picspam Sam Winchester Through the Ages

Lost:
colourmayfade's Picspam Seasn 3: Please Don't Give Up On Us
dizzyknee's Picspam Sawyer/Juliet - The Lost Quadrangle Picspam, Part 3
Clips: Michael Emerson Talks Lost

Dollhouse:
aka_katya's Painting Adelle & Topher, Epitaph One

Random:
Neil Gaiman Interview Transcripts
Nobody Here, Just Me - World's most awesome website ever.


* Neil Gaiman, here